WO2023000003A1

WO2023000003A1 - Drawer pull-out guide

Info

Publication number: WO2023000003A1
Application number: PCT/AT2022/060254
Authority: WO
Inventors: Harald Sutterlütti
Original assignee: Julius Blum Gmbh
Priority date: 2021-07-23
Filing date: 2022-07-15
Publication date: 2023-01-26
Also published as: TW202312908A; AT525325A1; CN117956927A

Abstract

The invention relates to a drawer pull-out guide (4) for movably supporting a drawer (3) on a furniture body (2), comprising: - a body rail (9) to be secured to the furniture body (2), - at least one loading rail (10) which is to be connected to the drawer (3) and which is movably mounted relative to the body rail (9) in a longitudinal direction (L), and - optionally at least one central rail which is arranged between the body rail (9) and the at least one loading rail (10), wherein - the drawer pull-out guide (4) has a dead weight and a maximum load-bearing capacity, and the ratio of the dead weight of the drawer pull-out guide (4) to the maximum load-bearing capacity of the drawer pull-out guide (4) is less than 1 to 50, preferably less than 1 to 57, particularly preferably less than 1 to 65.

Description

drawer slide

The present invention relates to a drawer pull-out guide for movably mounting a drawer on a furniture body, comprising:

- a body rail to be attached to the furniture body,

- at least one drawer rail to be connected to the drawer, which is mounted so that it can be displaced in a longitudinal direction relative to the cabinet rail,

- optionally at least one middle rail, which is arranged between the body rail and the at least one drawer rail,

- wherein the drawer slide has its own weight and a maximum load capacity.

The rails of a drawer pull-out guide are often made from a flat sheet metal, which is processed into a profile rail by subsequent bending and/or forming. The loads on the drawer slide in the horizontal and vertical directions are absorbed by the finished profiles, as a result of which the drawer connected to the drawer slide can be guided in a stable manner.

A general problem is the need for metal, which is usually necessary for the production of a drawer slide. A high use of material leads to a high weight and increased costs in serial production. It is therefore desirable to use as little metal as possible, especially since resource-conserving use of raw materials has both ecological and economic advantages.

The object of the present invention is to specify a drawer pull-out guide of the type mentioned at the outset, in which the stated problems of the prior art are at least partially avoided. According to the invention, this is achieved by the features of patent claim 1 . Further advantageous developments of the invention are specified in the dependent claims.

According to the invention, the ratio of the drawer pull-out guide's own weight to the maximum load capacity of the drawer pull-out guide is less than 1 to 50, preferably less than 1 to 57, particularly preferably less than 1 to 65.

Up to now, a person skilled in the field of the furniture fittings industry has assumed that a specific use of materials is required in order to implement a drawer pull-out guide that has a specific stability with a specified maximum load capacity. Conventional drawer slides from the applicant have, for example, a ratio of the drawer slide's own weight to the maximum load capacity of the drawer slide of 1 to 40 or more. Lower ratios did not seem to be feasible.

In the context of the invention, the applicant's specialists have surprisingly found, contrary to this expectation, that it is possible to advance to a completely different regime in the construction of drawer slides.

In this way, the use of materials can be significantly reduced, e.g. halved, which is associated with a considerable reduction in production costs and at the same time with considerable conservation of resources, especially in view of the high quantities that are common in the furniture fittings industry.

It should be noted that the technical testing and evaluation of drawer slides is standardized, at least in Europe. In this context, reference is made to the DIN EN 15338 standard, which defines the strength and durability of pull-outs and their components. However, this standard does not make any statements about the relationship between its own weight and the maximum load capacity of a drawer slide, The maximum load capacity is not an arbitrary value, but is defined for a specialist. As a rule, the maximum load capacity is also noted on the drawer slide, for example by embossing.

Provision is advantageously made for the at least one drawer rail to be displaceable relative to the cabinet rail over an extension length between a pushed-in end position and an extended end position, the at least one drawer rail having a front end to be connected to a front panel of the drawer and the front end of the at least a drawer rail in the extended end position can be lowered by a maximum of 4% of the extension length under a load which corresponds to the maximum load capacity.

The invention is particularly advantageous for a drawer slide that has a length of between 200 mm and 650 mm when fully pushed in and/or has a weight of between 125 g and 550 g and/or a maximum load capacity of between 15 kg and 35 kg, and/or is at least predominantly made of steel. According to a specific exemplary embodiment, it can be provided that the drawer pull-out guide has a maximum load capacity of 25 kg, a length of 500 mm and a weight of approximately 350 g.

Alternatively or in addition, it can be provided that at least one rolling element is arranged between the body rail and the at least one drawer rail, preferably with the at least one rolling element being mounted such that it can rotate about an axis of rotation, particularly preferably with the axis of rotation being aligned transversely to the longitudinal direction, and/or at least a carriage, in particular made of plastic, is provided, in which the at least one rolling body is arranged, and/or the at least one rolling body is essentially cylindrical, and/or the at least one rolling body consists at least for the most part of plastic. Such a drawer slide differs significantly in its design from other drawer slides, such as heavy-duty slides or ball guides. It has been found to be advantageous that the drawer pull-out guide is formed at least in sections from a flat sheet metal which has a material thickness of between 0.5 mm and 1.0 mm, preferably a material thickness of 0.7 mm. This means that a much thinner sheet metal is used than in a conventional drawer slide with a comparative design.

In a particularly advantageous manner, the low ratio of the drawer slide's own weight to the maximum load capacity of the drawer slide, compared to the prior art, can be realized in that the drawer slide has at least one, preferably more than one, property selected from the following group of properties i. to v, has:

Property i.: in a cross section perpendicular to the longitudinal direction, at least one of the rails has at least one profile formed from at least one flat metal sheet with two longitudinal edges running parallel to one another, the profile having at least one fold-over on at least one longitudinal edge, preferably on both longitudinal edges has at least twice the material thickness.

Property ii.: the carcass rail has at least one fastening section with a fastening side which can be placed at least in sections on the furniture carcass when the drawer pull-out guide is mounted on the furniture carcass, the at least one fastening section having at least one, preferably circular, opening for the passage of a fastening means, preferably one Screw, wherein the at least one opening on a second side spaced apart from the fastening side by a material thickness of the fastening section is surrounded by a bead, which protrudes transversely from the second side of the fastening section.

Property iii.: in a cross section perpendicular to the longitudinal direction, at least one of the rails has a profile formed from at least one flat sheet metal, with at least one, in particular two, end faces of the profile being designed with a taper. Property iv.: in a cross section normal to the longitudinal direction, at least one of the rails has at least one profile formed from at least one flat metal sheet with two longitudinal edges running parallel to one another, with at least one being arranged at least in regions over at least two essentially orthogonal to one another

Side surfaces of the profile extending embossing is arranged to stiffen the profile, wherein the side surfaces in the longitudinal direction and the at least one embossing is arranged substantially orthogonally to the longitudinal direction.

Property v.: in a cross-section normal to the longitudinal direction, at least one of the rails has at least one profile formed from at least one flat metal sheet with two longitudinal edges running parallel to one another, with at least two, preferably at least partially, being oriented substantially orthogonally to one another and/or embossings arranged on adjoining side faces and/or extending over at least two side faces are provided, the at least two embossings pointing alternately in the direction of an inner area and in the direction of an outer area of the at least one rail, in particular wherein the at least two embossings adjoin one another in the longitudinal direction.

The property i. is associated with the following technical advantages:

- on the one hand, a simple bending process of the sheet metal is possible, on the other hand, the rigidity of the profile can be increased in the area of the fold,

- the cover creates a rounded edge, which reduces the risk of injury from an otherwise sharp longitudinal edge,

--- thinner sheet metal than usual can be used for the manufacture of the drawer slide (e.g. sheet metal with a thickness of 0.7 mm instead of sheet metal with a thickness of 1.5 mm),

- The rigidity of the highly stressed areas of the body rail and/or the drawer rail and/or the center rail can be increased by the at least one envelope. The highly stressed areas include, in particular, the running tracks of the cabinet rail and/or the drawer rail and/or the center rail on which rolling elements (in particular rolling elements of a carriage) can be rolled,

--- Assuming, for example, that a thinner sheet metal with a thickness of 0.7 mm is used, the highly stressed areas are 1.4 mm thick due to the fold. The rolling elements can be optimally guided along the rails thanks to the resistant raceways. The remaining areas of the rails, which are not exposed to major loads, can be made with a simple, reduced material thickness (i.e. with a thickness of 0.7 mm). Through these measures, the use of materials, the weight and the costs for the production of the drawer pull-out guide can be significantly reduced.

In connection with the property i. It has proven to be advantageous that the at least one flap is arranged on at least one longitudinal edge of the carcass rail, wherein the flap can be placed when the carcass rail is fastened to the furniture carcass, and/or has at least two sheet metal sections that abut one another at least in regions on the at least one longitudinal edge , preferably wherein the at least two sheet metal sections have at least one common punching, and/or on the at least one longitudinal edge in a cross section normal to the longitudinal direction has at least one crease running in the longitudinal direction, preferably wherein the at least one fold-over is formed on at least one longitudinal edge of the carcass rail.

Alternatively or additionally, it can be provided that the drawer pull-out guide has at least one rolling body, which can be moved at least in sections in the longitudinal direction along the at least one cover.

Furthermore, in connection with the property i. It can be advantageous that the at least one drawer rail has at least one cover with at least twice the material thickness on both longitudinal edges, with the two covers being aligned transversely, preferably essentially at right angles, to one another and/or with one of the both envelopes are facing in and the other of the two envelopes is facing out.

The property ii. is associated with the following technical advantages:

- the opening is on the side of the screw head facing

Fastening section surrounded by a, preferably annular, bead, which is provided for at least partially receiving the screw head. The screw head is therefore within the bead at least partially, preferably in

Essentially complete, retractable,

- the bead strengthens the perimeter of the opening, i.e. the force from the underside of the screw head can be distributed over a larger area. The sinking of the screw head into the thin-walled metal of the fastening section can be reduced by the bead. The danger of a

Damage to the peripheral edge of the opening can therefore be reduced in this way

- If the bead is produced, for example, in the form of an embossing, a corresponding recess is formed on the fastening side of the fastening section, in which the chip material emerging from the furniture part can be at least partially accommodated. This also reduces the risk of the chip material penetrating between the fastening side of the fastening section and the furniture part and thus leading to an undesired spacing of the fastening section from the furniture part.

In relation to property ii. it has proven to be advantageous that the bead has a substantially toroidal cross-section and/or is formed in one piece together with the at least one fastening section and/or is produced in at least one fastening section by embossing.

The property iii. is associated with the following technical advantages:

- The taper can without chip-lifting separation process with a consequent cutting width - for example by mechanical Breaking, buckling and/or splitting - are generated, whereby material in the form of separation scrap can be saved and/or a degree of deformation in the course of a cutting process for the production of the drawer slide can be reduced, a risk of injury, in particular due to burrs, is reduced for one Users of the drawer slide and/or a fitter in the installation or maintenance work on the drawer slide are reduced, with machining post-processing steps not being absolutely necessary.

In relation to property iii. it has proven to be advantageous that the taper includes an angle in the range between 60° and 140°, preferably between 75° and 105°, particularly preferably essentially 90°, it being preferably provided that at least one, preferably both End surfaces are essentially burr-free, and/or have a tapering cross section parallel to the longitudinal extension of the metal sheet essentially in the form of a, preferably isosceles, triangle, it being preferably provided that the tapering cross section is convex and/or concave.

For example, identical or different depths and/or geometries can be used for at least one notch in the sheet metal, which manifests itself as a taper in the drawer pull-out guide, with a geometry of the taper being able to be flexibly adjusted via a geometry of the notch. The taper can act as a defined predetermined breaking point for tearing off and/or breaking off.

The properties iv. and V. are associated with the following technical advantages:

- the drawer pull-out guide 'is stiffened beyond a local increase in strength/stability, whereby in particular resistance moments and/or moments of inertia are increased and/or vibrations and deformations generated by pressure, tension, torsion, bending et cetera are reduced,

- The positioning of the at least one embossing in the longitudinal direction can be flexibly adapted to the requirements of the drawer pull-out guide be adapted so that areas of the drawer pull-out guide with particularly high loads are also equipped with a particularly high stability or strength due to the structural design via the at least one embossing,

- a degree of possible weight reduction of the drawer slide is higher than a measure of the weight class reduction (or weight reduction) associated with the weight reduction of furniture parts to be moved by the drawer slide, which interact mechanically with the drawer slide, with a given weight class (or weight) of through the drawer pull-out guide furniture parts to be moved can be used to save material by reducing the wall thickness of the sheet metal to form the drawer pull-out guide and/or compared to conventional drawer pull-out guides, heavier furniture parts can be moved - especially with the same service life if used properly,

- A distribution of forces, in particular during a bending process

Formation of the drawer pull-out guide and/or during use of the rail can be influenced particularly favorably in regions of the drawer pull-out guide with high stress, with a geometric fidelity of the in particular

Drawer pull-out guide can be guaranteed to a particularly high degree,

- with an alternating arrangement of embossing (relative to adjacent side surfaces and/or relative to the interior/exterior), the bending process from a flat sheet to a profile shape of the drawer slide can be favored in order to be able to manufacture a profile with particularly high geometric precision, which can be maintained over the period of use of the drawer slide,

- A gaping transverse to the longitudinal direction of

Drawer slide, whereby an angle between side surfaces of the profile undesirably increases under load, and/or a deformation that is detrimental to the functionality of the drawer slide, especially in the longitudinal direction, is effectively counteracted, but no additional Components are required to realize the technical effects,

The embossing can also be referred to as a beading or as a stiffening bead in the sense of a plastic deformation as strain hardening, which is driven into a sheet metal or a profile, in order to increase stability or strength - in particular by increasing resistance moments and/or moments of inertia and/or Reduction of swinging as well as deformations generated by pressure, tension, torsion, bending et cetera.

In connection with the properties iv. and V. has proven to be advantageous that at least one carriage with at least one rolling element and/or sliding element is or can be arranged on the drawer pull-out guide, with the at least one embossing being arranged on the at least one cabinet rail and/or the at least one drawer rail such that the at least one embossing in the longitudinal direction can be passed through the at least one carriage and/or the at least one rolling element and/or sliding element without contact.

This can ensure user-friendly guidance of the drawer pull-out guide, with the movement of the at least one carriage not being impaired by the at least one embossing.

Alternatively or additionally, it can be provided that exactly three embossings for stiffening the profile are arranged at least in regions on at least two essentially orthogonally arranged side faces of the at least one rail.

In the prior art, low material thicknesses are associated with significant performance losses and/or service life losses when the rail is in operation. Through three alternating relative to adjoining side surfaces and/or relative to an inner area and an outer area of the at least one rail—in particular drawer rail, cabinet rail and/or center rail—low material thicknesses can also be achieved Rails with high load requirements or heavy movable furniture parts are used.

It has proven to be particularly favorable that the at least two embossings are arranged on the same side surface or extending over at least two side surfaces on the same side surfaces and/or alternately on the at least two side surfaces, it being preferably provided that the at least two embossings are arranged alternately relative to the inner area and the outer area in a transition area of the at least two side surfaces.

For example, embossings can be arranged on a side surface, which are oriented alternately in the interior and exterior. Alternatively or in addition, one of the embossings can extend over two side faces and/or an alternating arrangement of the embossings relative to the side faces can be provided, with two embossings arranged next to one another being oriented essentially orthogonally to one another.

According to one exemplary embodiment, it can be provided that at least, preferably in the case of groups that may be present, exactly two embossings point in the direction of the inner area of the at least one rail and one embossing is arranged centrally between the at least two embossings and in the direction of the outer area of the at least one rail for elevation has a tensile/compressive load capacity.

With an increasing number of embossings, the rail’s tensile/compressive load-bearing capacity is successively increased, with a rail being subjected to particularly high forces without plastic and /or withstand improper elastic deformation. In addition, the at least one embossing can serve as a support when assembling the drawer pull-out guide.

And finally, in connection with properties iv. and V. at that the at least one embossing in orthogonal Direction relative to the longitudinal direction of the at least one rail extends over an area of between one third and three quarters of the side surface and/or over an area of less than one third, preferably one quarter, of a side surface adjoining this side surface.

In general, the at least one embossing can extend in a direction orthogonal to the longitudinal direction over an entire side surface, with such a structural design generally not being necessary due to the lower loads on free longitudinal edges. In particular in the case of an alternating arrangement of embossings in relation to the side surfaces, an expansion of the individual embossments in relation to one side surface can be reduced since both side surfaces are reinforced by embossings. This can increase an aesthetic appearance and/or reduce manufacturing costs. The at least one embossing can end in a transition area of the side surfaces or extend beyond it.

Further details and advantages of the present invention result from the following description of the figures.

Fig. 1a shows a piece of furniture with drawers in a perspective

Opinion,

Fig. 1b shows a piece of furniture with an extended drawer in a

side view,

Fig. 2 shows a drawer pull-out guide in a perspective view,

3a, 3b show a cross section of the drawer pull-out guide with and without a carriage,

4a, 4b show the body rail of the drawer pull-out guide in a perspective view from a first angle and in a cross-sectional view,

5a, 5b show the body rail of the drawer slide in a perspective view from a second angle, in a front side view and in a rear side view, 6a, 6b show the drawer rail of the drawer slide in a perspective view and in a side view from the front, and

Figures 7a, 7b, 7c show a method of making a profile of a rail of the drawer slide,

1a shows a perspective view of a piece of furniture 1 with a furniture body 2, with drawers 3 being mounted such that they can be moved relative to the furniture body 2 via drawer pull-out guides 4. For reasons of a better overview, the top drawer 3 is not shown. The drawers 3 each have a front panel 5 , a drawer bottom 6 , drawer side walls 7 and a rear wall 8 .

The drawer pull-out guides 4 comprise a carcass rail 9 which is to be fastened to the furniture carcass 2 via a fastening section 11 . Furthermore, at least one drawer rail 10 is provided, which is to be connected to the drawer 3 and which is movably mounted relative to the stationary body rail 9 .

Optionally, the drawer pull-out guide 4 can also have a middle rail, which can be moved between the body rail 9 and the drawer rail 10 and through which a full extension of the drawer 3 in relation to the furniture body 2 is possible.

The drawer side walls 7 can each have a hollow chamber profile 7a which is connected or can be connected to the at least one drawer rail 10 of the drawer pull-out guide 4 .

Fig. 1b shows a piece of furniture 1 with an extended drawer 3 in a side view. The at least one drawer rail 10 of the drawer extension guides 4, on which the drawer 3 is mounted, can be displaced relative to the cabinet rail 9 over an extension length (n) between a pushed-in end position and an extended end position.

The at least one drawer rail 10 has a front end connected to the front panel 5 of the drawer 3 and the front end the at least one drawer rail 10 can be lowered by a maximum of 4% of the extension length (n) in the extended end position with a load which corresponds to the maximum load capacity. The lowering of the front end is indicated with an arrow.

2 shows a drawer pull-out guide 4 in a perspective view, the body rail 9 to be fastened to the furniture body 2 and the drawer rail 10 that can be moved in the longitudinal direction (L) being shown. The carcass rail 9 is to be fastened to the furniture carcass 2 via a fastening section 11 .

The fastening section 11 has a fastening side 19 which can be placed against the furniture body 2 at least in sections during the assembly of the drawer pull-out guide 4 on the furniture body 2 .

The fastening section 11 can have at least one, preferably circular, opening 12 for the passage of a fastening means 28, in particular a screw 28a, through which the fastening section 11 is to be fastened to the furniture body 2a.

The at least one opening 12 is surrounded on a second side 20 facing away from the fastening side 19 by a preferably annular bead 21 which protrudes transversely from the second side 20 of the fastening section 11 .

Through this bead 21, the screw head of the screw 28a can be at least partially countersunk. In addition, the peripheral edge of the opening 12 is strengthened by the bead 21, reducing the risk of damage to the peripheral edge of the opening 12.

The fastening section 11 and/or the body rail 9 and/or the drawer rail 10 can each have at least one embossing 13 (also called a beading or stiffening bead). At least one opening 12 for a screw 28a to pass through can be arranged between two embossings 13, as a result of which the moment of resistance in this area can be increased. Fig. 3a, 3b show a cross section of the drawer slide 4 without and with carriage 22, Fig. 3a shows the drawer slide 4 in a cross section normal to the longitudinal direction (L). The body rail 9 to be fastened to the furniture body 2 and the drawer rail 10 that can be moved relative to the body rail 9 can be seen.

The fastening section 11 of the carcass rail 9 has a fastening side 19 which can be placed against the furniture carcass 2 at least in sections when the carcass rail 9 is fastened to the furniture carcass 2 .

The body rail 9 and/or the drawer rail 10 is or are bent from a flat sheet metal with two longitudinal edges 14a, 14b (drawer rail 10) and 15a, 15b (body rail 9) to form a profile 9a, 10a. The flat sheet has a material thickness (X).

The flat sheet metal from which the profile 9a, 10a is formed can, for example, have a material thickness (X) of between 0.5 mm and 1.0 mm, preferably a material thickness (X) of 0.7 mm.

The profile 9a of the body rail 9 and/or the profile 10a of the drawer rail 10 has or have at least one fold-over 16, 17 with at least twice the material thickness (2X). The at least one envelope 16, 17 preferably has exactly twice the material thickness (2X).

However, if appropriate, the envelope 16, 17 can also be folded three or more times, resulting in a material thickness (X) that is three or more times as high.

At least one cover 16, 17 can be arranged on a longitudinal edge 15b of the carcass rail 9, with this cover 16, 17 being able to be placed on the furniture carcass 2 when the carcass rail 9 is fastened.

According to one embodiment it can be provided that the at least one envelope 16, 17 is attached to the at least one longitudinal edge 14a, 14b, 15a, 15b has at least two sheet metal sections 24a, 24b which abut one another at least in certain areas.

The at least one drawer rail 10 can have at least one flap 16, 17 with at least twice the material thickness (2X) on both longitudinal edges 14a, 14b, with the two flaps 16, 17 being aligned transversely, preferably essentially at right angles, to one another and/or with one of the two envelopes 16, 17 faces inward and the other of the two envelopes 16, 17 faces outward.

At least one cover 16, 17 can have at least one crease 18 running in the longitudinal direction (L) on the at least one longitudinal edge 14a, 14b, 15a, 15b in a cross section normal to the longitudinal direction (L), preferably with the at least one cover 16, 17 on at least one longitudinal edge 15a of the carcass rail 9 is formed.

The at least one fastening section 11 can have at least one, preferably circular, opening 12 for the passage of a fastening means 28 (Fig. 2), preferably a screw 28a.

According to one exemplary embodiment, it can be provided that the at least one opening 12 on a second side 20 , which is spaced apart from the fastening side 19 by a material thickness (X) of the fastening section 11 , is surrounded by a bead 21 which protrudes transversely from the second side 20 .

The bead 21, which surrounds the opening 12, can significantly improve the rigidity of the fastening section 11 in the area of the opening 12, which is particularly advantageous when used with metal sheets with a thin material thickness (X).

At least one embossing 13 can have a longitudinal direction which extends transversely to the longitudinal direction (L) of the carcass rail 9 . At least one embossing 13 or several embossings 13 can be arranged on the vertical leg of the fastening section 11 and/or on the transverse leg of the fastening section 11 . FIG. 3b shows the drawer pull-out guide 4 according to FIG. 3a in a cross section with fitted rolling elements 23a, 23b, 23c.

Provision is preferably made for the rolling bodies 23a, 23b, 23c to be mounted in a common carriage 22, with the carriage 22 being movably mounted between the body rail 9 and the at least one drawer rail 10.

According to possible exemplary embodiments, it can be provided that at least one rolling element 23a has a cylindrical shape in the installed position, can be rotated about a horizontal axis and can be moved along the cover 16 of the drawer rail 10 .

At least one further rolling body 23a can be rotated about a horizontal axis in the installed position and can be moved along the fold-over 17 of the carcass rail 9 .

At least one further rolling element 23c can be rotated about a vertical axis in the installed position and can be moved along a section of the body rail 9 with a double wall thickness (2X).

The carriage 22 with the rolling elements 23a, 23b, 23c (which can alternatively or additionally also be designed as sliding elements) are arranged on the drawer pull-out guide 4, with the embossings 13 being arranged on the body rail 9 and the drawer rail 10 in such a way that the Stampings 13 in the longitudinal direction L can be passed through the carriage 22 and the rolling elements 23a, 23b, 23c without contact.

4a, 4b show the body rail 9 of the drawer pull-out guide 4 in a perspective view from a first angle and in a cross-sectional view.

4a shows the profile 9a of the cabinet rail 9 in a perspective view. The fastening section 11 for fastening the carcass rail 9 has a fastening side 19 for resting on the furniture carcass 2 . At least one opening 12 for passage is on the fastening section 11 a fastening means 28, in particular a screw 28a, through which the body rail 9 is to be fastened to the furniture body 2.

The at least one opening 12 is surrounded by a bead 21 on a second side 20 spaced apart from the fastening side 19 by a material thickness (X), which bulge protrudes transversely from the second side 20 of the fastening section 11 . The screw head of a screw 28a for fastening the fastening section 11 to the furniture body 2 is accommodated at least in regions, preferably essentially completely, within the annular bead 21 in an assembled state.

The abutting sheet metal sections 24a, 24b of the cover 16, 17 are connected to one another by at least one common stamping 25, 26. In this way, the envelope 16, 17 can be additionally stabilized.

According to one embodiment, two punches 25, 26 spaced apart from one another in the longitudinal direction (L) are provided.

According to preferred embodiments it can be provided that

- The at least one punching 25, 26 is arranged at one end of the profile 9a of the cabinet rail 9 and/or of the profile 10a of the at least one drawer rail 10, and/or

- At least two common punches 25, 26 are provided, preferably wherein the at least two punches 25, 26 are formed mirror-inverted to each other, and / or

--- at least one carriage 22 (Fig. 3b) is provided and the at least one punching 25, 26 forms a stop to limit a travel path of the at least one carriage 22, and / or

- The at least one punching 25, 26 is designed as an angled tab.

The at least one punching 25, 26 can therefore take on a dual function. On the one hand, the punching 25, 26 serves to stabilize the abutting sheet metal sections 24a, 24b of the cover 16, 17. On the other hand, the laterally protruding punching 25, 26 is intended to limit a travel path of the carriage 22 in the longitudinal direction (L). The carriage 11 is given a defined end position by the punching 25, 26 and consequently cannot move past one end of the carcass rail 9 and/or the at least one drawer rail 10.

FIG. 4b shows the drawer pull-out guide 4 according to FIG. 4a in a cross section. At least one recess 27 is arranged on the fastening side 19 of the fastening section 11 and adjacent to the at least one opening 12 for the purpose of accommodating in certain areas chip material that occurs. In this way, undesired lifting of the fastening section 11 from the furniture part 2 can be prevented when the fastening section 11 is screwed on.

5a, 5b, 5c show the body rail 9 of the drawer pull-out guide 4 in a perspective view from a second angle, in a side view from the front and in a side view from the rear.

5a shows the body rail 9 with two groups of three embossings 13 each, which are each spatially spaced apart from one another in an edge region of the body rail 9. FIG. In a cross section normal to the longitudinal direction L, the carcass rail 9 has a profile 9a formed from a flat sheet metal with two longitudinal edges 15a, 15b running parallel to one another, with three embossings 13 arranged on two mutually orthogonal and adjacent side surfaces 31 being provided in each group , the embossings 13 pointing alternately in the direction of an inner area 32 and in the direction of an outer area 33 of the carcass rail 9 . The embossings 13 of the groups adjoin one another in the longitudinal direction L.

The embossings 13 on the outside in the group each extend between one third and three quarters of the side surface 31 and end in the transition area of the adjacent side surface 31, with the centrally arranged embossing 13 extending over the entire side surface 31 and ending in the transition area. It is also conceivable for embossings 13 to extend beyond the transition area. The embossings 13 have a cross section that tapers in the direction of the longitudinal edges 15a, 15b, with three embossing surfaces being oriented in the manner of a truncated pyramid relative to one another, since greater stresses generally occur in the area of a transition of the side surfaces 31 than in the area of the longitudinal edges 15a, 15b.

Fig. 5b and Fig. 5c differ from Fig. 5a only by a changed viewing angle, with the body rail 9 being visible from a rear and a front. Exactly three embossings 13 for stiffening the profile 9a are arranged in regions on two orthogonally arranged side faces 31 of the carcass rail 9 per group.

Two embossings 13 are arranged on the same side surface 31 in each group and end in a transition area of the adjacent side surface 31. The embossings are arranged alternately on the two adjacent side surfaces 31, with the three embossings 13 of the respective group alternating in a transition area of the two side surfaces 31 are arranged relative to the inner area 32 and the outer area 33 . The three embossings 13 of the groups point alternately into the inner area 32 and the outer area 33, with two embossings 13 pointing in the direction of the inner area 32 of the carcass rail 10 and one embossing 13 being arranged centrally between the two embossings 13 and in the direction of the outer area 33 of the carcass rail 9 has to increase a tensile / compressive strength.

It can be seen in FIG. 5c that embossings 13 extend beyond a gradation in the profile 9a of the carcass rail 9 .

6a, 6b show the drawer rail 10 of the drawer pull-out guide 4 in a perspective view and in a side view from the front.

Fig. 6a shows a drawer rail 10 which, in a cross section normal to the longitudinal direction L, has a profile 10a formed from a flat sheet metal with two longitudinal edges 14a, 14b running parallel to one another and an embossing extending over two mutually orthogonal side surfaces 31 of the profile 10a 13 is arranged to stiffen the profile 10a. The side faces 31 are arranged orthogonally to the longitudinal direction L in the longitudinal direction L and the embossing 13 . The embossing 13 of the drawer rail has three embossing surfaces arranged orthogonally to one another.

Fig. 6b shows the drawer rail 10 in a side view, with the embossing 13 extending in the orthogonal direction relative to the longitudinal direction L of the drawer rail 10 over two adjacent side surfaces 31 and a punched-out portion is provided on the drawer rail 10, which extends into the interior area 32 has and serves as a stop for the carriage 22. The punched-out area is materially connected to two adjacent side faces 31 of the drawer rail 10 , one of these side faces 31 having the embossing 13 and the other side face 31 having a fold-over 16 . The embossing 13 extends over two side surfaces 31 just before a transition area of the associated side surfaces 31. The embossing 13 points in the direction of the outer area 33.

7a, 7b, 1c show a method for producing a profile 9a, 10a of a rail of the drawer pull-out guide 4,

7a shows a drawer rail 10 of the drawer pull-out guide 4, the drawer rail 10 having a profile 10a formed from a flat sheet metal in a cross section normal to the longitudinal direction L. One of the two end faces 29 of the profile 10a has a taper 30 caused by mechanical breaking off of a semi-finished product, it being possible for both end faces 29 to have a taper 30 in general.

To form the taper 30, two indentations 36 were made in the flat metal sheet, multiples extending over a width of the metal sheet oriented orthogonally to the longitudinal direction L and arranged on both cover surfaces of the metal sheet. The cross-section of the notch 36 is generally arbitrary and, as in the schematic detailed sections of a cross-section of a metal sheet, can represent, for example, a triangular shape or an elliptical section. The geometry and depths of a large number of notches 36 can also vary in general, with four notches 36 being particularly preferably used , around a drawer rail 10, a cabinet rail 9 or a center rail with a taper 30 per end face 30 to form by chipless mechanical cutting.

7b shows a metal sheet with two indentations 36 with a trapezoidal cross-section, which, after the drawer rail 10 has been cut to length, results in two indentations 30--one taper per drawer rail 10--result. In general, however, only one notch 36 on a top surface of the metal sheet can be used. Advantageously, the indentations 36 are made before a bending operation, although this is not absolutely necessary.

7c illustrates an embossing process for making the indentations 36 via an embossing stamp 37 and an embossing roller 38, two embossing rollers or two embossing stamps 37 being particularly preferably provided. The material thickness X of the sheet metal is reduced locally, so that the narrowing 30 with an angle 34 of 90° with a burr-free end surface 29 manifests itself on the rail to be formed.

A tapering cross section 35 parallel to the longitudinal extension of the sheet has the shape of an isosceles triangle, other geometries in the tapering cross section 35 being possible depending on the notches 36 - for example a right-angled triangle with a notch 36 on one side. The tapering 30 can have a production-related tapered bead on iron and be designed concave or convex.

Claims

patent claims

1. Drawer pull-out guide (4) for movably mounting a drawer (3) on a furniture body (2), comprising:

- a body rail (9) to be fastened to the furniture body (2),

- at least one drawer rail (10) to be connected to the drawer (3), which is mounted displaceably in a longitudinal direction (L) relative to the cabinet rail (9),

- optionally at least one middle rail, which is arranged between the body rail (9) and the at least one drawer rail (10),

- the drawer pull-out guide (4) having its own weight and a maximum load-bearing capacity, characterized in that the ratio of the drawer pull-out guide's own weight (4) to the maximum load-bearing capacity of the drawer pull-out guide (4) is less than 1 to 50, preferably less than 1 to 57, in particular preferably less than 1 in 65.

2. Drawer pull-out guide (4) according to claim 1, wherein the at least one drawer rail (10) can be displaced relative to the cabinet rail (9) over an extension length (n) between a pushed-in end position and an extended end position, the at least one drawer rail (10) has a front has an end to be connected to a front panel (5) of the drawer (3) and the front end of the at least one drawer rail (10) in the extended end position can be lowered by a maximum of 4% of the extension length(s) under a load which corresponds to the maximum load capacity is.

3. Drawer slide (4) according to claim 1 or 2, wherein the drawer slide (4)

- has a length between 200 mm and 650 mm in a fully retracted condition, and/or

- weighs between 125 g and 550 g, and/or

- has a maximum load capacity between 15 kg and 35 kg, and/or --- is at least mainly made of steel.

4. Drawer pull-out guide (4) according to one of claims 1 to 3, wherein between the body rail (9) and the at least one drawer rail (10) at least one rolling element (23a, 23b, 23c) is arranged, preferably wober

- the at least one rolling element (23a, 23b, 23c) is mounted so as to be rotatable about an axis of rotation, particularly preferably wherein the axis of rotation is aligned transversely to the longitudinal direction (L), and/or

- at least one carriage (22) is provided, in which the at least one rolling element (23a, 23b, 23c) is arranged, and/or

- The at least one rolling body (23a, 23b, 23c) is essentially cylindrical, and/or

- The at least one rolling element (23a, 23b, 23c) consists at least for the most part of plastic.

5. Drawer pull-out guide (4) according to one of claims 1 to 4, wherein the drawer pull-out guide (4) is formed at least in sections from a flat sheet metal which has a material thickness (X) between 0.5 mm and 1.0 mm, preferably a material thickness ( X) of 0.7 mm.

6. Drawer pull-out guide (4) according to one of claims 1 to 5, wherein the drawer pull-out guide (4) has at least one, preferably more than one, property selected from the following group of properties i. until v. has: i. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), at least one profile (9a, 10a) formed from at least one flat metal sheet with two longitudinal edges (14a, 14b, 15a, 15b) running parallel to one another, wherein the profile (9a, 10a) on at least one longitudinal edge

(14a, 14b, 15a, 15b), preferably on both longitudinal edges (14a, 14b, 15a, 15b), at least one envelope (16, 17) with at least twice the material thickness (2X), ii. the body rail (9) has at least one

Fastening section (11) with a fastening side (19) on, which can be applied at least in sections to the furniture body (2) when the drawer pull-out guide (4) is mounted on the furniture body (2), the 'at least one

Attachment section (11) at least one, preferably circular, opening (12) for the passage of a

fastening means, preferably a screw, wherein the at least one opening (11) on a second side (20) spaced apart from the fastening side (19) by a material thickness (X) of the fastening section (11) is surrounded by a bead (21), which projecting transversely from the second side (20) of the attachment portion (11), iii. At least one of the rails (9, 10) has a profile (9a, 10a) formed from at least one flat metal sheet in a cross section perpendicular to the longitudinal direction (L), with at least one, in particular two, end faces (29) of the profile (9a, 10a) is formed with a taper (30), iv. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), at least one profile (9a, 10a) formed from at least one flat metal sheet with two longitudinal edges (14a, 14b, 15a, 15b) running parallel to one another , wherein at least one embossing (13) extending at least in regions over at least two side surfaces (31) of the profile (9a, 10a) arranged essentially orthogonally to one another is arranged for stiffening the profile (9a, 10a), the side surfaces (31) in longitudinal direction (L) and the at least one embossing (13) is arranged essentially orthogonally to the longitudinal direction (L), v. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), at least one profile (9a, 10a) formed from at least one flat metal sheet with two longitudinal edges (14a, 14b, 15a, 15b) running parallel to one another , wherein at least two embossings (13) are provided, preferably at least in regions on at least two side faces (31) that are oriented substantially orthogonally to one another and/or are adjacent and/or extend over at least two side faces (31), wherein the at least two embossings (13) alternating in the direction of one

Inner area (32) and in the direction of an outer area (33) of the at least one rail (9, 10), in particular wherein the at least two embossings (13) adjoin one another in the longitudinal direction (L).

7. drawer slide (4) according to claim 6, wherein the

Drawer extension guide (4) at least the property i. and wherein the at least one envelope (16, 17)

- On at least one longitudinal edge (14a, 14b, 15a, 15b) of

Carcass rail (9) is arranged, the cover (16, 17) being able to be placed on the furniture carcass (2) when the carcass rail (9) is fastened, and/or

- on the at least one longitudinal edge (14a, 14b, 15a, 15b) has at least two sheet metal sections (24a, 24b) that abut one another at least in some areas, preferably wherein the at least two sheet metal sections (24a, 24b) have at least one common stamping (25, 26). , and or

- On the at least one longitudinal edge (14a, 14b, 15a, 15b) in one

cross-section normal to the longitudinal direction (L) has at least one crease (18) running in the longitudinal direction (L), preferably wherein the at least one fold-over (16, 17) is formed on at least one longitudinal edge (15a, 15b) of the carcass rail (9).

8. drawer slide (4) according to claim 6 or 7, wherein the

Drawer extension guide (4) at least the property i. and wherein the drawer pull-out guide (4) has at least one rolling body (23a, 23b, 23c) which can be moved at least in sections in the longitudinal direction (L) along at least the cover (16, 17).

9. drawer pull-out guide (4) according to any one of claims 6 to 8, wherein the drawer pull-out guide (4) has at least the property i. having, and wherein the at least one drawer rail (9) on both longitudinal edges (14a, 14b) has at least one envelope (16, 17) with at least twice the material thickness (2X), wherein the both flaps (16, 17) being aligned transversely, preferably substantially perpendicularly, to one another and/or with one of the two flaps (16, 17) facing inwards and the other of the two

Envelopes (16, 17) facing outwards.

10. drawer slide (4) according to claim 6, wherein the

Drawer pull-out guide (4) has at least property ii., and the bead (21)

- is essentially toroidal in cross-section, and/or

- is formed in one piece together with the at least one fastening section (11), and/or

- Is produced in at least one fastening section (11) by embossing.

11. drawer slide (4) according to claim 6, wherein the

Drawer pull-out guide (4) has at least property iii. has, and 'wherein the taper (30)

- an angle (34) in the range between 60° and 140°, preferably between 75° and 105°, particularly preferably essentially 90°, it being preferably provided that at least one, preferably both, end surfaces (29) essentially are formed without burrs, and/or

- has a narrowing cross section (35) parallel to the longitudinal extent of the metal sheet essentially in the form of a preferably isosceles triangle, it being preferably provided that the narrowing cross section (35) is convex and/or concave.

12. drawer slide (4) according to claim 6, wherein the

Drawer pull-out guide (4) has at least the property iv. and/or v. having, and wherein at least one carriage (22) with at least one rolling body (23a, 23b, 23c) and / or sliding body on the

Drawer pull-out guide (4) is or can be arranged, the at least one embossing (13) being arranged on the at least one cabinet rail (9) and/or the at least one drawer rail (10) in such a way that the at least one embossing (13) in The at least one carriage (22) and/or the at least one rolling body (23a, 23b, 23c) and/or sliding body can be passed in the longitudinal direction (L) without contact,

13. drawer slide (4) according to claim 6 or 12, wherein the

Drawer pull-out guide (4) has at least the property iv. and/or v. and wherein exactly three embossings (13) for stiffening the profile (9a, 10a) are arranged at least in regions on at least two essentially orthogonally arranged side surfaces (31) of the at least one rail (9, 10).

14, drawer pull-out guide (4) according to claim 6, 12 or 13, wherein the drawer pull-out guide (4) has at least the property iv. and/or v. and wherein the at least two embossings (13) are arranged on the same side surface (31) or extending over at least two side surfaces (31) on the same side surfaces (31) and/or arranged alternately on the at least two side surfaces (31), It is preferably provided that the at least two embossings (13) are arranged alternately in a transition area of the at least two side surfaces (31) relative to the inner area (32) and the outer area (33).

15, drawer pull-out guide (4) according to claim 6, 12, 13 or 14, 'wherein the drawer pull-out guide (4) has at least the property iv. and/or v. and 'whereby at least, preferably in the case of groups that may be present, exactly two embossings (13) point in the direction of the inner region (32) of the at least one rail (9, 10) and one embossing (13) in the middle between the at least two embossings (13 ) is arranged and in the direction of the outer area (33) of the at least one rail (9, 10) to increase a tensile

/ pressure resistance.

16. Drawer pull-out guide (4) according to claim 6, 12, 13, 14 or 15, wherein the drawer pull-out guide (4) has at least the property iv and _/ or v. having, and wherein the at least one embossing (13) in the orthogonal direction relative to the longitudinal direction (L) of the at least one rail (9, 10) over a region between a third and three quarters of the side surface (31) and/or extends over a region of less than one third, preferably one quarter, of a side surface (31) adjoining this side surface (31).